for starters though, the triangle shape is probably shared across a gaggle of styles.
As for principles, many have some sort of yielding.
When I met up with WD for the first time, we compared his chen taiji prinicples with my thai stuff. we found several things in common, such as yielding and borrowing.
i'm nobody...i'm nobody. i'm a tramp, a bum, a hobo... a boxcar and a jug of wine... but i'm a straight razor if you get to close to me.
-Charles Manson
I will punch, kick, choke, throw or joint manipulate any nationality equally without predjudice.
- Shonie Carter